double buffered in c# [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicates:

How do I double buffer a Panel in C#?

c# panel for drawing graphics and scrolling

I draw a bitmap on a panel, i use zooming on the same panel. While zooming the panel is continuously flickering. Why do not panel have the DoubleBuffered property?

Code:

                Graphics g = Graphics.FromHwnd(panel.Handle);
        开发者_运维技巧        if (newImage == true)
                {
                    g.Clear(SystemColors.Control);
                    newImage = false;
                }

                g.DrawImage(bmp, hOffset, vOffset);
                g.Dispose();

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Add this code inside the constructor

this.SetStyle(ControlStyles.AllPaintingInWmPaint |ControlStyles.UserPaint |ControlStyles.DoubleBuffer, true);

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use this.

System.Drawing.BufferedGraphics

I am a game developer.In games we first draw all objects in a backbuffer and then copy or flip it to frontbuffer.You can use

System.Drawing.BufferedGraphics

as backbuffer and render it to graphics object.

System.Drawing.Graphics

for example:

        System.Drawing.Graphics g = this.CreateGraphics();
        System.Drawing.BufferedGraphicsContext dc = new BufferedGraphicsContext();
        BufferedGraphics backbuffer = dc.Allocate(g, new Rectangle(new Point(0, 0), g.VisibleClipBounds.Size.ToSize()));
        backbuffer.Graphics.DrawImage(Image.FromFile(@"c:\test.jpg"), new Point(10, 10));
        backbuffer.Render(g);

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Where are you painting the bitmap?

If not in the Paint event or OnPaint override, then it is wrong.

To answer your question, only forms have the DoubleBuffered property, IIRC.

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Im not 100% sure but cant you activate DoubleBuffered on the form/window instead?

And one tip if your going to use gui with alot of effects i would go with WPF instead of winforms..

You can also override OnPaint and OnPaintBackground..